linux-kernel - Re: [PATCH v3 01/12] mm: Make pagecache tagged lookups return only head pages

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Message-ID: <20201112174150.GC17076@casper.infradead.org>
Date:   Thu, 12 Nov 2020 17:41:50 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Dave Chinner <dchinner@...hat.com>,
        linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>
Subject: Re: [PATCH v3 01/12] mm: Make pagecache tagged lookups return only
 head pages

On Wed, Oct 28, 2020 at 09:50:56AM +0200, Mike Rapoport wrote:
> > @@ -2074,8 +2074,8 @@ EXPORT_SYMBOL(find_get_pages_contig);
> >   * @nr_pages:	the maximum number of pages
> >   * @pages:	where the resulting pages are placed
> >   *
> > - * Like find_get_pages, except we only return pages which are tagged with
> > - * @tag.   We update @index to index the next page for the traversal.
> > + * Like find_get_pages(), except we only return head pages which are tagged
> > + * with @tag.   We update @index to index the next page for the traversal.
> 
> Nit:                                           ^ next head page

I don't love the sentence anyway.  How about:

 * Like find_get_pages(), except we only return head pages which are tagged
 * with @tag.  @index is updated to the index immediately after the last
 * page we return, ready for the next iteration.